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You searched for subject:(Cartographie terrestre). Showing records 1 – 2 of 2 total matches.

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1. Nouira, Houssem. Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars.

Degree: Docteur es, Informatique temps r?el, robotique et automatique, 2017, Paris Sciences et Lettres

Les Syst?mes Mobiles de Cartographie bas?s LIDAR permettent d?obtenir des cartes 3D de l?environnement, qui sont g?o-r?f?renc?es gr?ce ? d?autres capteurs embarqu?s sur le v?hicule : GPS, centrale inertielle, ou encore odom?tre sont de tels capteurs qui permettent de localiser le v?hicule mobile pendant la campagne d?acquisition. Toutefois, ces cartes manquent de pr?cisions et un affinage des cartes est essentiel dans de nombreux cas d?applications o? une pr?cision fine est requise sur les cartes 3D, comme pour des applications de classifications par exemple.Lors de la cr?ation de cartes 3D g?or?f?renc?es,les donn?es sont tout d?abord acquises par le capteur LIDAR et r?f?renc?es dans le rep?re cart?sien du laser ? l?aide d?un calibrage intrins?que du capteur d?acquisition. Ensuite, un calibrage extrins?que du capteur permet de caract?riser la transformation entre le capteur et le v?hicule, et permet de r?f?rencer les donn?es dans le rep?re ? body?, li? au v?hicule d?acquisition. Enfin, avec la trajectoire du v?hicule obtenue en fusionnant les donn?es issues des GPS, centrale inertielle et odom?tre, il est possible de g?or?f?rencer les donn?es lasers.Nous proposons dans cette th?se d?affiner les relev?s laser issus d?acquisitions effectu?es ? l?aide d?un v?hicule mobile de cartographie, en optimisant plusieurs param?tres diff?rents qui entrent en compte dans le g?or?f?rencement des donn?es. Nous nous sommes int?ress?s ? l?affinement des nuages de points par optimisation des param?tres decalibrage extrins?que dans un premier temps, puis par optimisation des param?tres de calibrage intrins?que, et enfin par optimisation des param?tres de translations li?s ? la trajectoire du v?hicule mobile.

LIDAR based Mobile Mapping Systems allowto get 3D maps of the environment, which are globally referenced with the help of others sensors embedded on the vehicle: GPS,Inertial Measurement Unit, or odometer are such sensors which allow localizing the vehicle during the acquisition process. However, these maps lack of precision, and are finement of the maps is necessary for manywork where a good precision is needed on the 3D maps, like classification applications for example.When creating the globally referenced 3D maps, the data are firstly acquired by the LIDAR sensor and referenced in the Cartesian reference frame of the sensor withan intrinsic calibration of the sensor. Then, anextrinsic calibration gives the transformation between the sensor and the vehicle, and gives data referenced in the ? body ?reference frame, linked to the vehicle. Finally, with the fusion of the data coming from the GPS, the Inertial Measurement Unit and theodometer, the laser data can be globally referenced.In this thesis, we propose to refine the point clouds coming from acquisitions done with a mobile mapping system, by optimizing some parameters which are used in the georeferencing process of the data. Firstly, we were interested in the refinement of point clouds by optimizing the extrinsic calibration parameters, and then we were interested in the…

Advisors/Committee Members: Goulette, Fran?ois (thesis director), Deschaud, Jean-Emmanuel (thesis director).

Subjects/Keywords: Affinement de relev?s laser; LIDAR multi-couches; Calibrage; V?hicule mobile de cartographie; Cartographie terrestre; Recalage de donn?es; Point clouds refinement; Multi-beam LIDAR; Calibration; Mobile mapping vehicle; Terrestrial mapping; Data adjustment; 621.366

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Nouira, H. (2017). Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars. (Doctoral Dissertation). Paris Sciences et Lettres. Retrieved from http://www.theses.fr/2017PSLEM015

Chicago Manual of Style (16th Edition):

Nouira, Houssem. “Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars.” 2017. Doctoral Dissertation, Paris Sciences et Lettres. Accessed March 22, 2019. http://www.theses.fr/2017PSLEM015.

MLA Handbook (7th Edition):

Nouira, Houssem. “Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars.” 2017. Web. 22 Mar 2019.

Vancouver:

Nouira H. Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres; 2017. [cited 2019 Mar 22]. Available from: http://www.theses.fr/2017PSLEM015.

Council of Science Editors:

Nouira H. Affinement de relev?s laser mobiles issus de LIDARs multi-couches : Refinement of mobile lasers scans coming from multi-beam Lidars. [Doctoral Dissertation]. Paris Sciences et Lettres; 2017. Available from: http://www.theses.fr/2017PSLEM015


Université de Sherbrooke

2. Béland, Martin. Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale .

Degree: 2011, Université de Sherbrooke

This thesis takes its place in a context where information on the biophysical state of forest ecosystems at spatial scales only remote sensing can retrieve is in demand more than ever. In order to provide reliable information using validated approaches, the remote sensing research community recognises the need for new and innovative methods, especially in heterogeneous environments like savannas. The recent emergence of terrestrial LiDAR scanners (TLS) and the increase in the computational capability of computers which allow running ray tracing model simulations with a high level of realism hold great potential to improve our understanding of the processes influencing the radiance measured by satellite sensors. This thesis makes use of these two cutting edge technologies for estimating the spatial distribution of tree leaf area, a key element of modeling radiative transfer processes. The first part of the thesis concerns the development of methods for estimating tridimensional leaf area distribution in a savanna environment from TLS measurements. The methods presented address certain issues related to TLs measures affecting the application of classical theories (the probability of light transmission and the contact frequency) to the estimation of leaf area through indirect means. These issues pertain to the cross-section of laser pulses emitted by a TLS and the occlusion effects caused by the interception of laser pulses by material inside the crown. The developed methods also exploit additional information provided by the active nature of the TLS sensor that is not available to passive sensors like hemispherical photography, i.e. the intensity of a pulse return offers the possibility to distinguish between energy interception by wood and foliage. A simplified approach of this method is presented to promote its use by other research groups. This approach consists of a series of parameterisations and represents a significant gain in terms of the required resources to produce the leaf area, estimates. The second part of the thesis explores the combination of the tree representations generated in the first part with a ray tracing model to simulate the interactions of light with tree crowns. This approach is highly innovative and our study showed its potential to improve our understanding of the factors influencing the radiative environment in a savanna. The methods presented offer a solution to map leaf area at the individual tree scale over large areas from very high spatial resolution imagery. Advisors/Committee Members: Fournier, Richard (advisor), Ansseau, Colette (advisor).

Subjects/Keywords: Modélisation du transfert radiatif; Lancer de rayons; Cartographie de la surface foliaire; Paramétrage; Effets d'occlusion; Indice de surface foliaire (LAI); Densité de surface foliaire (LAD); Savanes; Distribution 3D de surface foliaire; Voxel; Scanneur LiDAR terrestre

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Béland, M. (2011). Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale . (Doctoral Dissertation). Université de Sherbrooke. Retrieved from http://savoirs.usherbrooke.ca/handle/11143/2849

Chicago Manual of Style (16th Edition):

Béland, Martin. “Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale .” 2011. Doctoral Dissertation, Université de Sherbrooke. Accessed March 22, 2019. http://savoirs.usherbrooke.ca/handle/11143/2849.

MLA Handbook (7th Edition):

Béland, Martin. “Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale .” 2011. Web. 22 Mar 2019.

Vancouver:

Béland M. Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale . [Internet] [Doctoral dissertation]. Université de Sherbrooke; 2011. [cited 2019 Mar 22]. Available from: http://savoirs.usherbrooke.ca/handle/11143/2849.

Council of Science Editors:

Béland M. Estimation de paramètres structuraux des arbres dans une savane à partir de mesures LiDAR terrestre et d'imagerie à très haute résolution spatiale . [Doctoral Dissertation]. Université de Sherbrooke; 2011. Available from: http://savoirs.usherbrooke.ca/handle/11143/2849

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